1979 k5 blazer questions

I have a 1979 k5 blazer. I have heard these were used as army national gaurd vehicles. I didn't know if there was any way of telling if a vehicle was used by the military without a carfax or spending money on a title search. What makes me curious is the gas cap area is powder coated army green and I was told there are several factory add on to beef up the suspension and frame. If anyone has any ideas on this subject let me know. Thank you.